I'm a believer in Marvel Mystery Oil. used it for years then quit. I'll add a quart before time to do an oil change and run it for a couple hundred miles and then change the oil. Since I started back using it, seams things are quieter. Works or not I don't know but I feel good about it.
I've been hunting down my engine noises for a few months now. Replace exhaust manifold, timing chain and gears, steering pump, lifters, rockers, and just yesterday distributor. Each replacement made it a bit quieter. As of now no more noises that I'm worried about
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